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Until last Saturday, advertisers wanting to buy an ad on Snapchat had to negotiate directly with the company’s ad sales team. But starting Oct. 1, Snap, the app’s owner, began allowing some advertisers to bid on ad space using automated systems run by outside ad tech firms. It was a long-awaited ...

News sites are in a race to speed up their mobile webpages so they can compete better with Facebook and Google. Sites such as Slate, NYMag.com and the Washington Post are trying various ways to make ad-clogged pages load faster. While some tactics could cost ad revenue, doing nothing risks ...

Most video ads on Facebook are seen for only a second or two, according to a new study, well below the average for video ads on YouTube and other websites. It suggests few people on Facebook are clicking on video ads as they scroll past them in their News Feed.

Frustrated by an online advertising marketplace in which many banner ads and videos are paid for but never seen, ad agencies and their clients have begun demanding that publishers provide robust, contractual guarantees on ad “viewability.